Paul,
Still assuming I will be testing the turbo-compound idea I've got some rough
drawings done on how to directly bolt and sandwich a multi-rib pulley,
between the engine counter weight and aluminum starter gear flywheel. The
vibrational dampers and steel plate to catch the sun gear shaft would then
attached to the Al. starter gear flywheel. Usually a clutch plate is
attached to it and the unit mounted on racing engines.
Looking at this configuration and thinking of Tracy's unit, both would have
to be mass balanced in and of themselves or they would throw the engine out
of balance right? That means all bolts, rubber donuts pulleys, spacers etc.
have to go in their exact positions.
For your info Dave Garber bolted up the Bell 47 3:1 gearbox directly to the
engine counter weight with no vibrational dampening at all.
Doug Fir
Hi Doug,
Just as a reminder, if you add belts between the engine and the prop
like it sounds from your description you will need to remove the prop
each time you need to refresh the belts. One of the major recip
manufacturers does this with a belted alternator setup and it has
historically been a monumental PIA as the engine compartment heat
rapidly degrades the belt material. I would suggest if at all possible
belt your input to the H2O pump end as Paul has shown in some of his
renderings. Dave M
Hi Dave,
There are a lot more painful design points to deal with in testing a
turbo-compound concept then just a belt location:) The present engine build
up is for testing the turbo compound and documenting its merits. I've
chosen what I think is the least painful and proven technique to do this by
using off the shelf components with a minimum of machining required.
The actual first T.C. engine bench test runs will send the power through a
CVT to a dummy load not even on the engine so power turbine output can be
measured.
The pulley is there if the T.C. system is found to have a good merit or
for use with other accessories if not. Final size to be determined. You are
are absolutely correct about heat build up but the bell housing I am using
has a large cut-out on the bottom and another one at the N.E.E. position
so I imagine it could be air cooled.
Regards
Doug
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